Since its application in 1971, because the heat tracing power varies with the temperature at each point of the electric heat tracing cable, the heated semiconductor core material behaves as a variable temperature resistor opposite to the trend of heating temperature high/low. Self-regulating electric heat tracing cables have become the most common type of electric heat tracing cables in the world today. They can be widely used for transportingliquid objects in pipelines and freeze protection of tanks, maintaining process temperature, heating roads, ramps, crosswalks, eaves, floors, etc.
Self-regulating electric heat tracing cables have semiconductor polymer materials distributed between two conductive cores for heating, and the exterior consists of a polymer inner jacket, alloy shielding mesh, and polymer outer jacket. When current passes through, as the temperature of the heat tracing cable rises, the cable resistance also increases. As a result, the output power of the heat tracing cable decreases as its temperature increases. Since the heat tracing power varies with the temperature at each point of the electric heat tracing cable, the heated semiconductor core material behaves as a variable temperature resistor opposite to the trend of heating temperature high/low. Self-regulating electric heat tracing cables will not overheat even when overlapped. No special design is required; the working length of self-regulating electric heat tracing cables can be cut arbitrarily on site to precisely match the actual laying length of the pipeline, without special tools, and installation is extremely simple.
1. Copper core wire: 7×0.50, 19×0.32, 19×0.41
2. Conductive plastic layer: Ordinary PTC, Flame-retardant PTC, Fluorine-containing PTC
3. Insulation layer: Modified polyolefin, Flame-retardant polyolefin, Fluorine-containing polyolefin, Perfluorinated material
4. Shielding layer: Tinned soft round copper wire, coverage density 80%
5. Jacket layer: Modified polyolefin, Flame-retardant polyolefin, Fluorine-containing polyolefin, Perfluorinated material
3. Construction temperature: Minimum: -5°C
4. Thermal stability: After 300 cycles between 15°C and 99°C, the cable heat output remains above 90%.
5. Bending radius: 25.4mm at room temperature 20°C, 35.0mm at low temperature -30°C
6. Insulation resistance: For cable length 100m, ambient temperature 75°C, using 2,500VDC megger for 1 minute, insulation resistance (between conductor and shield) minimum value is 120MΩ.
7. Starting current (10°C): 0.4A per meter
8. For installation and use, please refer to some precautions
9. Maximum use length: not exceeding 100 meters
Classification by Temperature
According to the different composition of polymer PTC materials, self-regulating heating cables are divided into low-temperature type and high-temperature type.
Common ones on the market include polyolefin ← Previous
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